//
// get capability list, possibly start tls
//
static char*
pop3capa(Pop *pop)
{
char *s;
int hastls;
pop3cmd(pop, "CAPA");
if(!isokay(pop3resp(pop)))
return nil;
hastls = 0;
for(;;){
s = pop3resp(pop);
if(strcmp(s, ".") == 0 || strcmp(s, "unexpected eof") == 0)
break;
if(strcmp(s, "STLS") == 0)
hastls = 1;
if(strcmp(s, "PIPELINING") == 0)
pop->pipeline = 1;
if(strcmp(s, "EXPIRE 0") == 0)
return "server does not allow mail to be left on server";
}
if(hastls && !pop->notls){
pop3cmd(pop, "STLS");
if(!isokay(s = pop3resp(pop)))
return s;
if((s = pop3pushtls(pop)) != nil)
return s;
}
return nil;
}
//
// log in to IMAP4 server, select mailbox, no SSL at the moment
//
static char*
imap4login(Imap *imap)
{
char *s;
UserPasswd *up;
imap->tag = 0;
s = imap4resp(imap);
if(!isokay(s))
return "error in initial IMAP handshake";
if(imap->user != nil)
up = auth_getuserpasswd(auth_getkey, "proto=pass service=imap server=%q user=%q", imap->host, imap->user);
else
up = auth_getuserpasswd(auth_getkey, "proto=pass service=imap server=%q", imap->host);
if(up == nil)
return "cannot find IMAP password";
imap->tag = 1;
imap4cmd(imap, "LOGIN %Z %Z", up->user, up->passwd);
free(up);
if(!isokay(s = imap4resp(imap)))
return s;
imap4cmd(imap, "SELECT %Z", imap->mbox);
if(!isokay(s = imap4resp(imap)))
return s;
return nil;
}
//
// dial and handshake with the imap server
//
static char*
imap4dial(Imap *imap)
{
char *err, *port;
int sfd;
TLSconn conn;
if(imap->fd >= 0) {
imap4cmd(imap, "noop");
if(isokay(imap4resp(imap)))
return nil;
close(imap->fd);
imap->fd = -1;
}
if(imap->mustssl)
port = "imaps";
else
port = "imap";
if((imap->fd = dial(netmkaddr(imap->host, "net", port), 0, 0, 0)) < 0)
return imaperrstr(imap->host, port);
if(imap->mustssl) {
sfd = starttls(imap, &conn);
if (sfd < 0) {
free(conn.cert);
return imaperrstr(imap->host, port);
}
if(imap->debug) {
char fn[128];
int fd;
snprint(fn, sizeof fn, "%s/ctl", conn.dir);
fd = open(fn, ORDWR);
if(fd < 0)
fprint(2, "opening ctl: %r\n");
if(fprint(fd, "debug") < 0)
fprint(2, "writing ctl: %r\n");
close(fd);
}
}
Binit(&imap->bin, imap->fd, OREAD);
Binit(&imap->bout, imap->fd, OWRITE);
if(err = imap4login(imap)) {
close(imap->fd);
return err;
}
return nil;
}
//
// sync mailbox
//
static void
imap4purge(Imap *imap, Mailbox *mb)
{
int ndel;
Message *m, *next;
ndel = 0;
for(m=mb->root->part; m!=nil; m=next) {
next = m->next;
if(m->deleted && m->refs==0) {
if(m->inmbox && (ulong)(m->imapuid>>32)==imap->validity) {
imap4cmd(imap, "UID STORE %lud +FLAGS (\\Deleted)", (ulong)m->imapuid);
if(isokay(imap4resp(imap))) {
ndel++;
delmessage(mb, m);
}
} else
delmessage(mb, m);
}
}
//
// delete marked messages
//
static void
pop3purge(Pop *pop, Mailbox *mb)
{
Message *m, *next;
if(pop->pipeline){
switch(rfork(RFPROC|RFMEM)){
case -1:
fprint(2, "rfork: %r\n");
pop->pipeline = 0;
default:
break;
case 0:
for(m = mb->root->part; m != nil; m = next){
next = m->next;
if(m->deleted && m->refs == 0){
if(m->inmbox)
Bprint(&pop->bout, "DELE %d\r\n", m->mesgno);
}
}
Bflush(&pop->bout);
_exits(nil);
}
}
for(m = mb->root->part; m != nil; m = next) {
next = m->next;
if(m->deleted && m->refs == 0) {
if(m->inmbox) {
if(!pop->pipeline)
pop3cmd(pop, "DELE %d", m->mesgno);
if(isokay(pop3resp(pop)))
delmessage(mb, m);
} else
delmessage(mb, m);
}
}
}
//
// download a single message
//
static char*
imap4fetch(Mailbox *mb, Message *m)
{
int i;
char *p, *s, sdigest[2*SHA1dlen+1];
Imap *imap;
imap = mb->aux;
imap->size = 0;
if(!isokay(s = imap4resp(imap)))
return s;
p = imap->base;
if(p == nil)
return "did not get message body";
removecr(p);
free(m->start);
m->start = p;
m->end = p+strlen(p);
m->bend = m->rbend = m->end;
m->header = m->start;
imap->base = nil;
imap->data = nil;
parse(m, 0, mb, 1);
// digest headers
sha1((uchar*)m->start, m->end - m->start, m->digest, nil);
for(i = 0; i < SHA1dlen; i++)
sprint(sdigest+2*i, "%2.2ux", m->digest[i]);
m->sdigest = s_copy(sdigest);
return nil;
}
//
// check for new messages on pop server
// UIDL is not required by RFC 1939, but
// netscape requires it, so almost every server supports it.
// we'll use it to make our lives easier.
//
static char*
pop3read(Pop *pop, Mailbox *mb, int doplumb)
{
char *s, *p, *uidl, *f[2];
int mesgno, ignore, nnew;
Message *m, *next, **l;
// Some POP servers disallow UIDL if the maildrop is empty.
pop3cmd(pop, "STAT");
if(!isokay(s = pop3resp(pop)))
return s;
// fetch message listing; note messages to grab
l = &mb->root->part;
if(strncmp(s, "+OK 0 ", 6) != 0) {
pop3cmd(pop, "UIDL");
if(!isokay(s = pop3resp(pop)))
return s;
for(;;){
p = pop3resp(pop);
if(strcmp(p, ".") == 0 || strcmp(p, "unexpected eof") == 0)
break;
if(tokenize(p, f, 2) != 2)
continue;
mesgno = atoi(f[0]);
uidl = f[1];
if(strlen(uidl) > 75) // RFC 1939 says 70 characters max
continue;
ignore = 0;
while(*l != nil) {
if(strcmp((*l)->uidl, uidl) == 0) {
// matches mail we already have, note mesgno for deletion
(*l)->mesgno = mesgno;
ignore = 1;
l = &(*l)->next;
break;
} else {
// old mail no longer in box mark deleted
if(doplumb)
mailplumb(mb, *l, 1);
(*l)->inmbox = 0;
(*l)->deleted = 1;
l = &(*l)->next;
}
}
if(ignore)
continue;
m = newmessage(mb->root);
m->mallocd = 1;
m->inmbox = 1;
m->mesgno = mesgno;
strcpy(m->uidl, uidl);
// chain in; will fill in message later
*l = m;
l = &m->next;
}
}
// whatever is left has been removed from the mbox, mark as deleted
while(*l != nil) {
if(doplumb)
mailplumb(mb, *l, 1);
(*l)->inmbox = 0;
(*l)->deleted = 1;
l = &(*l)->next;
}
// download new messages
nnew = 0;
if(pop->pipeline){
switch(rfork(RFPROC|RFMEM)){
case -1:
fprint(2, "rfork: %r\n");
pop->pipeline = 0;
default:
break;
case 0:
for(m = mb->root->part; m != nil; m = m->next){
if(m->start != nil)
continue;
Bprint(&pop->bout, "LIST %d\r\nRETR %d\r\n", m->mesgno, m->mesgno);
}
Bflush(&pop->bout);
_exits(nil);
}
}
for(m = mb->root->part; m != nil; m = next) {
next = m->next;
if(m->start != nil)
continue;
if(s = pop3download(pop, m)) {
// message disappeared? unchain
fprint(2, "download %d: %s\n", m->mesgno, s);
delmessage(mb, m);
mb->root->subname--;
continue;
}
nnew++;
parse(m, 0, mb, 1);
if(doplumb)
mailplumb(mb, m, 0);
}
if(pop->pipeline)
waitpid();
if(nnew || mb->vers == 0) {
mb->vers++;
henter(PATH(0, Qtop), mb->name,
(Qid){PATH(mb->id, Qmbox), mb->vers, QTDIR}, nil, mb);
}
return nil;
}
//
// download a single message
//
static char*
pop3download(Pop *pop, Message *m)
{
char *s, *f[3], *wp, *ep;
char sdigest[SHA1dlen*2+1];
int i, l, sz;
if(!pop->pipeline)
pop3cmd(pop, "LIST %d", m->mesgno);
if(!isokay(s = pop3resp(pop)))
return s;
if(tokenize(s, f, 3) != 3)
return "syntax error in LIST response";
if(atoi(f[1]) != m->mesgno)
return "out of sync with pop3 server";
sz = atoi(f[2])+200; /* 200 because the plan9 pop3 server lies */
if(sz == 0)
return "invalid size in LIST response";
m->start = wp = emalloc(sz+1);
ep = wp+sz;
if(!pop->pipeline)
pop3cmd(pop, "RETR %d", m->mesgno);
if(!isokay(s = pop3resp(pop))) {
m->start = nil;
free(wp);
return s;
}
s = nil;
while(wp <= ep) {
s = pop3resp(pop);
if(strcmp(s, "unexpected eof") == 0) {
free(m->start);
m->start = nil;
return "unexpected end of conversation";
}
if(strcmp(s, ".") == 0)
break;
l = strlen(s)+1;
if(s[0] == '.') {
s++;
l--;
}
/*
* grow by 10%/200bytes - some servers
* lie about message sizes
*/
if(wp+l > ep) {
int pos = wp - m->start;
sz += ((sz / 10) < 200)? 200: sz/10;
m->start = erealloc(m->start, sz+1);
wp = m->start+pos;
ep = m->start+sz;
}
memmove(wp, s, l-1);
wp[l-1] = '\n';
wp += l;
}
if(s == nil || strcmp(s, ".") != 0)
return "out of sync with pop3 server";
m->end = wp;
// make sure there's a trailing null
// (helps in body searches)
*m->end = 0;
m->bend = m->rbend = m->end;
m->header = m->start;
// digest message
sha1((uchar*)m->start, m->end - m->start, m->digest, nil);
for(i = 0; i < SHA1dlen; i++)
sprint(sdigest+2*i, "%2.2ux", m->digest[i]);
m->sdigest = s_copy(sdigest);
return nil;
}
//
// log in using APOP if possible, password if allowed by user
//
static char*
pop3login(Pop *pop)
{
int n;
char *s, *p, *q;
char ubuf[128], user[128];
char buf[500];
UserPasswd *up;
s = pop3resp(pop);
if(!isokay(s))
return "error in initial handshake";
if(pop->user)
snprint(ubuf, sizeof ubuf, " user=%q", pop->user);
else
ubuf[0] = '\0';
// look for apop banner
if(pop->ppop==0 && (p = strchr(s, '<')) && (q = strchr(p+1, '>'))) {
*++q = '\0';
if((n=auth_respond(p, q-p, user, sizeof user, buf, sizeof buf, auth_getkey, "proto=apop role=client server=%q%s",
pop->host, ubuf)) < 0)
return "factotum failed";
if(user[0]=='\0')
return "factotum did not return a user name";
if(s = pop3capa(pop))
return s;
pop3cmd(pop, "APOP %s %.*s", user, n, buf);
if(!isokay(s = pop3resp(pop)))
return s;
return nil;
} else {
if(pop->ppop == 0)
return "no APOP hdr from server";
if(s = pop3capa(pop))
return s;
if(pop->needtls && !pop->encrypted)
return "could not negotiate TLS";
up = auth_getuserpasswd(auth_getkey, "proto=pass service=pop dom=%q%s",
pop->host, ubuf);
if(up == nil)
return "no usable keys found";
pop3cmd(pop, "USER %s", up->user);
if(!isokay(s = pop3resp(pop))){
free(up);
return s;
}
pop3cmd(pop, "PASS %s", up->passwd);
free(up);
if(!isokay(s = pop3resp(pop)))
return s;
return nil;
}
}
//
// check for new messages on imap4 server
// download new messages, mark deleted messages
//
static char*
imap4read(Imap *imap, Mailbox *mb, int doplumb)
{
char *s;
int i, ignore, nnew, t;
Message *m, *next, **l;
imap4cmd(imap, "STATUS %Z (MESSAGES UIDVALIDITY)", imap->mbox);
if(!isokay(s = imap4resp(imap)))
return s;
imap->nuid = 0;
imap->uid = erealloc(imap->uid, imap->nmsg*sizeof(imap->uid[0]));
imap->muid = imap->nmsg;
if(imap->nmsg > 0) {
imap4cmd(imap, "UID FETCH 1:* UID");
if(!isokay(s = imap4resp(imap)))
return s;
}
l = &mb->root->part;
for(i=0; i<imap->nuid; i++) {
ignore = 0;
while(*l != nil) {
if((*l)->imapuid == imap->uid[i]) {
ignore = 1;
l = &(*l)->next;
break;
} else {
// old mail, we don't have it anymore
if(doplumb)
mailplumb(mb, *l, 1);
(*l)->inmbox = 0;
(*l)->deleted = 1;
l = &(*l)->next;
}
}
if(ignore)
continue;
// new message
m = newmessage(mb->root);
m->mallocd = 1;
m->inmbox = 1;
m->imapuid = imap->uid[i];
// add to chain, will download soon
*l = m;
l = &m->next;
}
// whatever is left at the end of the chain is gone
while(*l != nil) {
if(doplumb)
mailplumb(mb, *l, 1);
(*l)->inmbox = 0;
(*l)->deleted = 1;
l = &(*l)->next;
}
// download new messages
t = imap->tag;
if(pipeline)
switch(rfork(RFPROC|RFMEM)) {
case -1:
sysfatal("rfork: %r");
default:
break;
case 0:
for(m = mb->root->part; m != nil; m = m->next) {
if(m->start != nil)
continue;
if(imap->debug)
fprint(2, "9X%d UID FETCH %lud (UID RFC822.SIZE BODY[])\r\n",
t, (ulong)m->imapuid);
Bprint(&imap->bout, "9X%d UID FETCH %lud (UID RFC822.SIZE BODY[])\r\n",
t++, (ulong)m->imapuid);
}
Bflush(&imap->bout);
_exits(nil);
}
nnew = 0;
for(m=mb->root->part; m!=nil; m=next) {
next = m->next;
if(m->start != nil)
continue;
if(!pipeline) {
Bprint(&imap->bout, "9X%lud UID FETCH %lud (UID RFC822.SIZE BODY[])\r\n",
(ulong)imap->tag, (ulong)m->imapuid);
Bflush(&imap->bout);
}
if(s = imap4fetch(mb, m)) {
// message disappeared? unchain
fprint(2, "download %lud: %s\n", (ulong)m->imapuid, s);
delmessage(mb, m);
mb->root->subname--;
continue;
}
nnew++;
if(doplumb)
mailplumb(mb, m, 0);
}
if(pipeline)
waitpid();
if(nnew || mb->vers == 0) {
mb->vers++;
henter(PATH(0, Qtop), mb->name,
(Qid) {
PATH(mb->id, Qmbox), mb->vers, QTDIR
}, nil, mb);
}
return nil;
}
